Abstract In this work, we used NaxCoO2 as a model system for the first time to explore the effect of Na+/vacancy ordering on desalination performance. An asymmetrical FDI device was developed where NaxCoO2 as the Faradic electrode material and AC act as the Cl-storage electrode material. For x = 0.50, this configuration yields an ultrahigh desalination capacity (130.2 mg g−1), an excellent charge efficiency (100%), and a superior desalination rate (2.61 mg g−1 min−1) in 1000 mg L−1 NaCl solution at 1.4 V. The experimental results reveal that the desalination capacity depends on the range of reversible adjacent intermediate phases region and the desalination rate is affected by the sodium ions mobility in the interlayer determined by the Na+/vacancy ordering pattern between the CoO2 slabs. The excellent desalination capacity and rate are encouraging.

中文翻译：

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Na+/空位排序对NaxCoO2脱盐性能的促进作用洞察

摘要 在这项工作中，我们首次使用 NaxCoO2 作为模型系统来探索 Na+/空位排序对脱盐性能的影响。开发了一种非对称 FDI 装置，其中 NaxCoO2 作为法拉第电极材料，AC 作为 Cl 存储电极材料。对于 x = 0.50，这种配置在 1000 mg L-1 中产生超高的脱盐能力（130.2 mg g-1）、优异的充电效率（100%）和优异的脱盐率（2.61 mg g-1 min-1） 1.4 V NaCl 溶液。 实验结果表明，脱盐能力取决于可逆相邻中间相区域的范围，脱盐率受夹层中钠离子迁移率的影响，由 CoO2 板之间的 Na+/空位排序模式决定.